中文摘要：

脉冲激光激发NaK 21Σ＋←11Σ＋跃迁，单模Ti宝石激光器激发21Σ＋至高位态61Σ＋，研究了61Σ＋与H2碰撞中的碰撞转移。3 D→4 P（1.7μm ）和5 S→4 P（1.24μm ）荧光发射说明了预解离和碰撞解离的产生。在不同的H2密度下，通过以上能级的荧光测量得到了预解离率，碰撞解离及碰撞转移速率系数ΓP3D ＝（5.3＆#177;2.5）×108 s-1，ΓP5S ＝（3.1±1.5）×108 s-1，k3D ＝（3.7±1.7）×10-11 cm3＆#183; s-1，k5S ＝（2.9±1.4）×10-11 cm3·s-1，k4P→4S＝（1.1±0.5）×10-11 cm3·s-1，k3D→4P＝（6.5±3.1）×10-12 cm3·s-1，k5S→4P＝（4.1±1.9）×10-12 cm3· s-1。在不同 H2密度下，记录时间分辨荧光，由Stern-Volmer公式得到61Σ＋→21Σ＋，21Σ＋→11Σ＋的自发辐射寿命分别为（28±10） ns和（15＆#177;4） ns。61Σ＋→21Σ＋，61Σ＋→11Σ＋及21Σ＋→11Σ＋分子态间与H2的碰撞转移速率系数分别为（1.8±0.6）×10-11 cm3·s-1，（1.6±0.5）×10-10 cm3·s-1和（6.3±1.9）×10-11 cm3·s-1。转移到H2的振动、转动和平动能各占总转移能的0.58，0.03和0.39。主要能量转移至振动和平动能，支持61Σ＋- H2间的共线型碰撞机制。

英文摘要：

The radiative lifetimes and rate coefficients for deactivation of high lying 61Σ＋ state of NaK by collisions with H2 were studied .An OPO laser was set to a particular 21Σ＋ ←11Σ＋ transition .Another single mode Ti sapphire laser was then used to excite molecule from 21Σ＋ level to the 61Σ＋ state .The predissociation was monitored by the atomic potassium emission at the 3D→4P （1.7 μm） or the S→4P（1.24μm） ,while bound state radiative processes were monitored by total fluorescence from the upper state to the various levels ,all studied as a function of H2 density .The values for predissociation ,collisional dissociation and collisional depopulation rate coefficients were obtained .The decay signal of the time resolved fluorescence from the 61Σ＋ →21Σ＋ ,61Σ＋ →11Σ＋ or 21Σ＋ →11Σ＋ transition was monitored .Based on the Stern-Volmer equation ,the radiative lifetimes were monitored for 61Σ＋ →21Σ＋ and 21Σ＋ →11Σ＋ transition .The rate coefficients for deactivation of collisions with H 2 were moni-tored for 61Σ＋ →21Σ＋ ,61Σ＋ →11Σ＋ and 21Σ＋ →11Σ＋ .When the density of H2 was 1019 cm -3 ,the total collisional transfer en-ergy （15 426 cm-1 ） and radiative energy （10 215 cm -1 ） were obtained .The relative fraction （＆lt;fv＆gt; ,＆lt;fR＆gt; ,＆lt;fT＆gt;） of average en-ergy disposal was derived as （0.58 ,0.03 ,0.39）;＆lt;fv＆gt; ,＆lt;fR＆gt; ,＆lt;fT＆gt; represent separately the relative fraction of average energy disposal among vibration ,rotation and translation .The major vibrational and translational energy release supports the assump-tion that the 61Σ＋-H2 collision occurs primarily in a collisional energy transfer mechanism .In this experiment ,alkali molecules relative energy population ratio was determined through using the time integrated intensity ,so we can get the total transfer ener-gy .That the NaK （61Σ＋ ） energy transfers to the H2 vibrational ,rotational and translational energy was q